在Linux中查看文件并过滤空行的多种方法

grep -v '^$' filename

grep -v '^[[:space:]]*$' filename

sed '/^$/d' filename

sed '/^[[:space:]]*$/d' filename

awk 'NF' filename

awk 'NF {print NR, $0}' filename

cat -s filename | grep -v '^$'

# 测试字符串
printf "Line1\n\nLine3\n" | grep -v '^$'

# 输出结果：
# Line1
# Line3

grep -n '[^[:space:]]' filename | grep -v '^[[:space:]]*$'

grep -v '^$' file1 file2 file3

# 使用 sed 原地编辑
sed -i '/^[[:space:]]*$/d' filename

# 安全备份版本
sed -i.bak '/^[[:space:]]*$/d' filename

grep -c '[^[:space:]]' filename

# 处理 Windows 格式文件（CRLF）
grep -v $'^[[:space:]]*\r$' windows_file.txt

# 处理 tab 分隔文件
awk -F'\t' 'NF > 0' tab_file.tsv

# 添加到 ~/.bashrc
alias nlcat="awk 'NF {print NR, \$0}'"
alias nocat="grep -v '^[[:space:]]*$'"

source ~/.bashrc

nocat filename  # 显示无空行文件
nlcat filename   # 带行号显示无空行文件

First line


Second line with space after:    
	Third line with tab
	
Last line

grep -v '^[[:space:]]*$' example.txt

First line
Second line with space after:    
	Third line with tab
Last line